Geologic time scale
Take a journey back through the history of the Earth jump to a specific time period using the time scale below and examine ancient life, climates, and geography. You might wish to start in the Cenozoic Era (65.5 million years ago to the present) and work back through time, or start with Hadean time (4.6 to 4 billion years ago)* and journey forward to the present day it's your choice. [Note: "mya" means "millions of years ago"]
Ways to begin your exploration:
* Dates from the International Commission on Stratigraphy's International Stratigraphic Chart, 2009; colors adopted from the Commission for the Geological Map of the World, 5/26/2011.
Allen G. Collins created this page, 11/26/94; Robert Guralnick and Brian R. Speer made revisions, 9/15/95; Brian R. Speer made further modifications, 6/4/98; Allen G. Collins reordered the time units with younger times above older times, 12/14/98; Sarah Rieboldt updated the page using the Geological Society of America (GSA) 1999 Geologic Timescale, 11/2002; Dave Smith created a new geologic time table using the ICS dates, adapted the page to the new site format, and made some content changes, 5/26/2011